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Continuous variations in the composition of melt inclusions in diamonds from K-rich saline to carbonatitic indicate their possible genetic relationship. This causes interest in the study of chloride-carbonate systems at high pressure. Here we present experimental data on phase relations in the KCl–CaCO 3  and KCl–MgCO 3  systems at 6 GPa and 1000–1600 °C. The studied systems have the eutectic type of  T-X  diagrams. Subsolidus phases are represented by aragonite + KCl and magnesite + KCl. The KCl–CaCO 3  eutectic is situated at 1200 °C and K2# 20, while the KCl–MgCO 3  eutectic is located at 1400 °C and K2# 43, where K2# = 2KCl/(2KCl + CaCO 3  + MgCO 3 )×100 mol%. The concentration of K and Cl in water-soluble chloride, and Ca, Mg, and CO 2  in carbonate suggests that K-rich saline fluid entrapped by ‘fibrous’ diamonds could be a low-temperature derivative of a carbonatite melt containing KCl and H 2 O.

The systems KCl–CaCO 3 and KCl–MgCO 3 at 6 GPa